// VerifyClaim checks that the printer has been claimed.
// If the printer is claimed, VerifyClaim returns no error.
// If the printer is unclaimed, VerifyClaim retruns ErrUnclaimed.
// It is possible for VerifyClaim to return other errors, such as
// in the case of network problems.
//
// A side effect of verifying that claim is that Google creates
// a synthetic account that is only useful in a future call to
// NewServer, to manage just this one printer.
// The information about that account can be retrieved
// from the Auth, Printer, and Server methods after VerifyClaim
// succeeds.
func (p *OpenPrinter) VerifyClaim() error {
if p.verify != nil {
return nil
}
var resp verifyResponse
if err := jsonRPC(&p.auth, "GET", p.register.PollingURL+p.auth.APIClientID, nil, &resp); err != nil {
return fmt.Errorf("VerifyClaim: %v", err)
}
var tr oauth.Transport
tr.Config = &oauth.Config{
ClientId: p.auth.APIClientID,
ClientSecret: p.auth.APIClientSecret,
Scope: "https://www.googleapis.com/auth/cloudprint https://www.googleapis.com/auth/googletalk",
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
RedirectURL: "oob",
}
tok, err := tr.Exchange(resp.AuthorizationCode)
if err != nil {
return fmt.Errorf("VerifyClaim: oauth exchange: %v", err)
}
p.auth.Token = *tok
p.auth.TokenUser = resp.UserEmail
p.auth.XMPPJID = resp.XMPPJID
p.verify = &resp
return nil
}
func httpGET(auth *Auth, url string) ([]byte, error) {
verb := "GET"
req, err := http.NewRequest("GET", url, nil)
if err != nil {
return nil, err
}
if i := strings.Index(url, "?"); i >= 0 {
url = url[:i]
}
req.Header.Set("X-CloudPrint-Proxy", auth.ProxyID)
var client *http.Client
if auth.Token.AccessToken != "" {
var tr oauth.Transport
tr.Config = &oauth.Config{
ClientId: auth.APIClientID,
ClientSecret: auth.APIClientSecret,
Scope: "https://www.googleapis.com/auth/cloudprint https://www.googleapis.com/auth/googletalk",
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
RedirectURL: "oob",
}
tr.Token = &auth.Token
client = tr.Client()
} else {
client = http.DefaultClient
}
resp, err := client.Do(req)
if err != nil {
return nil, fmt.Errorf("%s %s: %v", verb, url, err)
}
defer resp.Body.Close()
var buf bytes.Buffer
_, err = io.Copy(&buf, resp.Body)
if err != nil {
return nil, fmt.Errorf("%s %s: reading HTTP response: %v", verb, url, err)
}
// TODO: Check 200
return buf.Bytes(), nil
}
func jsonRPC(auth *Auth, verb, url string, mr *multipartRequest, dst interface{}) error {
var reader io.Reader
if mr != nil {
if auth.ProxyID != "" {
mr.WriteField("proxy", auth.ProxyID)
}
mr.Writer.Close()
reader = &mr.buf
}
req, err := http.NewRequest(verb, url, reader)
if err != nil {
return err
}
if i := strings.Index(url, "?"); i >= 0 {
url = url[:i]
}
if mr != nil {
req.Header.Set("Content-Type", mr.FormDataContentType())
}
if auth.ProxyID != "" {
req.Header.Set("X-CloudPrint-Proxy", auth.ProxyID)
}
var client *http.Client
if auth.Token.AccessToken != "" {
var tr oauth.Transport
tr.Config = &oauth.Config{
ClientId: auth.APIClientID,
ClientSecret: auth.APIClientSecret,
Scope: "https://www.googleapis.com/auth/cloudprint https://www.googleapis.com/auth/googletalk",
AuthURL: "https://accounts.google.com/o/oauth2/auth",
TokenURL: "https://accounts.google.com/o/oauth2/token",
RedirectURL: "oob",
}
tr.Token = &auth.Token
client = tr.Client()
} else {
client = http.DefaultClient
}
resp, err := client.Do(req)
if err != nil {
return fmt.Errorf("%s %s: %v", verb, url, err)
}
defer resp.Body.Close()
var buf bytes.Buffer
_, err = io.Copy(&buf, resp.Body)
if err != nil {
return fmt.Errorf("%s %s: reading HTTP response: %v", verb, url, err)
}
if resp.StatusCode != http.StatusOK {
return fmt.Errorf("%s %s: %s\n%s", verb, url, resp.Status, buf.Bytes())
}
fmt.Printf("%s\n", buf.Bytes())
var js jsonStatus
if err := json.Unmarshal(buf.Bytes(), &js); err != nil {
return fmt.Errorf("%s %s: invalid JSON response: %v", verb, url, err)
}
if !js.Success {
suffix := ""
if js.Message != "" {
msg := js.Message
if len(msg) > 2 && 'A' <= msg[0] && msg[0] <= 'Z' && 'a' <= msg[1] && msg[1] <= 'z' {
msg = string(msg[0]+'a'-'A') + msg[1:]
}
suffix = ": " + msg
} else {
suffix = "\n" + buf.String()
}
return fmt.Errorf("%s %s: server rejected request%s", verb, url, suffix)
}
if dst != nil {
if err := json.Unmarshal(buf.Bytes(), dst); err != nil {
return fmt.Errorf("%s %s: invalid JSON response: %v", verb, url, err)
}
}
return nil
}